CVE-2008-6806 in 7Shop
Summary
by MITRE
Unrestricted file upload vulnerability in includes/imageupload.php in 7Shop 1.1 and earlier allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in images/artikel/.
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Analysis
by VulDB Data Team • 11/09/2024
The vulnerability identified as CVE-2008-6806 represents a critical unrestricted file upload flaw within the 7Shop e-commerce platform version 1.1 and earlier. This vulnerability exists in the imageupload.php script located in the includes directory, which fails to properly validate or sanitize file uploads submitted by remote attackers. The flaw allows malicious actors to bypass security controls and upload potentially harmful files to the web server, creating a significant attack surface for code execution.
The technical implementation of this vulnerability stems from insufficient input validation mechanisms within the file upload functionality. When users attempt to upload images through the web interface, the application does not adequately verify the file type or extension before storing the uploaded content. Attackers can exploit this weakness by uploading files with executable extensions such as .php, .asp, .jsp, or other server-side script extensions. The uploaded files are subsequently stored in the images/artikel/ directory, making them directly accessible via web requests. This design flaw directly violates security principles of least privilege and input validation, as the application fails to distinguish between legitimate image files and potentially malicious executable content.
The operational impact of this vulnerability is severe and multifaceted. Remote attackers can leverage this weakness to execute arbitrary code on the affected web server, potentially gaining full control over the hosting environment. Once successful, attackers can establish persistent backdoors, steal sensitive customer data, modify product catalogs, or even use the compromised server for further attacks against other systems. The vulnerability affects the confidentiality, integrity, and availability of the e-commerce platform, as it provides an entry point for attackers to compromise the entire system. This type of vulnerability is particularly dangerous in web applications that handle sensitive customer information, payment data, or business-critical operations.
Security professionals should note that this vulnerability aligns with CWE-434, which specifically addresses "Unrestricted Upload of File with Dangerous Type." The attack pattern described in the MITRE ATT&CK framework under T1190 "Exploit Public-Facing Application" demonstrates how attackers can leverage such flaws to gain initial access to target systems. Organizations should implement multiple layers of defense including proper file type validation, content inspection, and secure file storage practices. The recommended mitigations include implementing strict file extension whitelisting, validating file content rather than relying solely on extensions, using randomized file names, storing uploaded files outside the web root, and implementing proper access controls. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other parts of the application stack.